CN103270869A - Method for repairing sludge heavy metal by combination of DTPA and ryegrass - Google Patents
Method for repairing sludge heavy metal by combination of DTPA and ryegrass Download PDFInfo
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- CN103270869A CN103270869A CN2013101782406A CN201310178240A CN103270869A CN 103270869 A CN103270869 A CN 103270869A CN 2013101782406 A CN2013101782406 A CN 2013101782406A CN 201310178240 A CN201310178240 A CN 201310178240A CN 103270869 A CN103270869 A CN 103270869A
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Abstract
The invention discloses a method for repairing sludge heavy metal by combination of DTPA and ryegrass. According to the method, DTPA of different concentrations serving as chelating agents is combined with the ryegrass and a corn interlayer to improve enrichment of heavy metal on the upper portion of a ryegrass land and to restrain the ability of the sludge heavy metal to move to deep soil in a leaching mode. The corn interlayer comprises 40-60g of vermiculite, 40-80g of zeolite and 40-100g of corncobs. According to the method, sludge and soil mixed substrate serves as culture substrate of the ryegrass, when turfgrass grows to a certain stage, DTPA is used, rainfall and pH of TianJin are simulated for leaching, and the content of the heavy metal in the upper portion of the ryegrass land and in leaching solutions is tested. As is shown in an experiment result, a combination of 10mmol.kg-1 DTPA and the interlayer comprising the corncobs has the best repairing effect on the heavy metal in the sludge, repairing cost is low and pollution to underground water is least.
Description
Technical field
The invention belongs to environmental protection technical field, relate to complexing agent and strengthen the research that lawn plant is repaired sludge heavy-metal, particularly a kind of DTPA of employing associating perennial ryegrass adds the method that interlayer is repaired sludge heavy-metal.
Background technology
Along with the quickening of Urbanization in China, the increase of urban population, the city domestic sewage discharge capacity is increasing, and the quantum of output of mud is corresponding increasing sharply also.According to statistics, China builds up the sewage treatment plant more than 420 of running at present, and year disposal ability 113.6 hundred million t produce the dewatered sludge amount per year and reach more than 130 ten thousand t, and increase with annual 10% speed.Britain's sludge yield had 1,200,000 tons approximately in 1999, will develop into 2,180,000 tons by 2006.The U.S. produces 6,200,000 tons of urban sewage dewatered sludges every year approximately.The composition of mud is very complicated, the extremely complicated heterogeneous body of being formed by organic relic, bacterium thalline, inorganic particle and colloid etc., because mud contains the poisonous and harmful substances such as organic matter, pathogen, parasitic ovum and heavy metal of some difficult degradations, can cause secondary environmental pollution if deal with improperly.The accumulation meeting of a large amount of mud works the mischief to environment and resource, how to handle and effectively utilizes mud to become problem demanding prompt solution.At present, adopt muds such as burning, landfill, ocean disposal and soil utilization both at home and abroad usually.Because the actual required nutritive elements of plant growth such as a large amount of organic substances and nitrogen, phosphorus, potassium that contain in the mud, be the quality material that carries out aspects such as soil reparation, forest land utilization, farmland utilization and afforestation, therefore many developed countries with the soil utilization of mud as an important method of disposal.All contain the heavy metal element of pollution in the municipal sludge of the overwhelming majority, its kind and quantity is different and different because of urban life, production characteristics also, mainly contain Cu, Pb, Zn, Ni, Cr, Hg and Cd etc., are the main obstacles that recycling sludge utilizes.One studies show that: carried out 30 mud tests at German soil, mud does not have obvious influence to heavy metal in soil and the wheat particle, but Cd concentration is significantly increased in the plant.Along with the continuous reinforcement of China environmental protection consciousness, corresponding standard and measure are also progressively perfect, and content of beary metal such as Zn, Mn, As and Pb descend year by year in the sewage of China city discharging in recent years.Generally speaking, content of beary metal is lower in the mud that sanitary sewage produces, and the content of beary metal of industrial sewage mud is then often higher.
Agricultural resource is the most promising method of disposal of municipal sludge, is beneficial to the sustainable development of city and agricultural.The soil utilization of mud mainly comprises contents such as mud is agricultural, the mud gardens utilize, use in the mud forest land, mud is repaired impaired soil utilization, and it not only can effectively utilize the nutriment that mud contains, and expense is low, the amount of dissolving is big, is considered to the disposal options that mud has development potentiality most.Containing very high N, P, K and organic matter in the mud, and contain the necessary micronutrient element of many plants, is a kind of cost-effective fertilizer source, and therefore, mud is to be modifying agent and the fertilizer of good soil by the nutrient resource of plant utilization.Increase the soil organic matter and N, P level, and increase biological activity of soil.The crop yield that applying sludge is handled is higher, and can satisfy the nutritional need of succession crop growth.But the heavy metal in the mud and pathogen content are still the problem that can not despise.The utilization of mud soil comprises directly uses and uses two kinds indirectly.Directly using is that raw sewerage mud is applied directly on the soil, as the agricultural land, and forestry land; Use indirectly and comprise agricultural after the sludge digestion or after the compostization or make compound fertilizer and use that this method can reduce the part noxious bacteria in the mud on the other hand to the nutrient resource reusing in the mud on the one hand, increases the stability of mud.Lack organic matter according to the many farmlands of relevant research China, directly use output and the quality that all can significantly improve agricultural product behind applying sludge or the compost.In China, agricultural Application of Sludge begins early to be used for the soil as Gaobeidian City, Beijing in 1961 sludge of sewage treatment plants by local peasant.But mud and the agricultural research of mud are started late.Because mud also contains higher calorific value, can be used as fuel and use to realize sludge reduction, innoxious, stabilisation and resource, residual active sludge and preliminary sedimentation tank mud can also be carried out anaerobic digestion respectively, utilize sludge heat energy to prepare biogas.The sludge composting utilization can increase and utilize cost; Therefore, air-dry mud directly utilizes, and should have significant values.In any case but the heavy metal in the mud is the limiting factor of its safe utilization.
Some lawn plant kinds can be grown in the heavier matrix of heavy metal pollution, and fast growth, regeneration capacity are strong, have bigger using value in the collaborative phytoremediation of chemical method.In addition, can also cultivate no native turf with the mud leacheate, leacheate under the drip washing again of adding chelating agent, contain organic matter, full nitrogen, available phosphorus and other nutritive element content and be significantly higher than the control soil leacheate, can fully satisfy the lawn plant growth needs, the content of beary metal of the mud after drip washing just reduces can be applied to reality.The environmentally friendly adsorbent that the discarded object preparation that utilizes agro-industry to produce has broad prospect of application, for new approach is explored in the cyclic utilization of waste, research passivator is to the characterization of adsorption of heavy metal, for it provides scientific basis in sludge heavy-metal reparation and safe utilization thereof.
Municipal sludge contains abundant nutritive element, can be used as fertilizer, but the too high levels of heavy metal in the mud wants to be applied to reality, must remove the heavy metal of the inside, just can avoid second environmental pollution.In recent years, Chinese scholars has been carried out a large amount of about utilizing the research of complexing agent fortification of plants repairing polluted soil.Chelating agent can be combined by the heavy metal ion in the soil solution, thereby makes heavy metallic activation, increases its enrichment in plant corpus.
Summary of the invention
The invention discloses a kind of corncob interlayer that promotes lawn plant enrichment sludge heavy-metal, it is characterized in that it is made up of following raw material:
40-60 g vermiculite+40-80 g zeolite+40-100g corncob.
The present invention further discloses and adopt the corncob interlayer, the method by DTPA associating perennial ryegrass is repaired sludge heavy-metal is characterized in that being undertaken by following step:
(1) in pvc pipe, lower end envelope cotton and nylon wire, the garden mould that the 1000g that packs into is air-dry is paved, and reinstalls 750 g mixed-matrixes; Described mixed-matrix refers to: mud: the ratio of weight and number of garden mould is 1:2, and mud is paved on garden mould;
(2) between pvc pipe garden mould and mixed-matrix, add an interlayer; Described interlayer is made up of 40 g vermiculites+40 g zeolites+40 g corncobs;
(3) sowing 1.0 g ryegrass seeds in the pvc pipe, with running water pouring, normal water supply between culture period, keeping its whole field capacity is 60%; Temperature and relative moisture indoor between planting season are respectively 16-25 ° of C and 36-57%, and intensity of illumination is 450-700 μ mol m
-2s
-1
(4) the perennial ryegrass sowing was 10-20 mmolkg with concentration after 30 days
-1DTPA is dissolved in the disposable mixed-matrix surface that imposes on of distilled water; Then turfgrass is cradled, cradle back second day with the artificial acid rain of 300 mL perennial ryegrass is carried out the drip washing first time, per 7 d drip washing afterwards once, each artificial rainwater drip washing of all using 300 mL, drip washing is 5 times altogether, collects leacheate, carries out the mensuration of content of beary metal then;
Described artificial rainwater drip washing refers to: with (NH
4)
2SO
4, Na
2SO
4, K
2SO
4, MgSO
4, Ca (NO
3)
2, Mg (NO
3)
2, H
2SO
4Make SO
4 2-, NO
3-, Cl
-, NH
+, Mg
2+, Ca
2+, K
+, Na
+Concentration is respectively 14.96,6.54,1.68,3.71,0.82,1.38,0.64 and 0.78 mgL
-1Rainwater, and be 5.59-5.61 with HCl allotment pH.
The present invention also discloses DTPA associating perennial ryegrass simultaneously and has repaired the application of sludge heavy-metal method in the plants enriched heavy metal of preparation promotion.10 mmolkg wherein
-1DTPA is collaborative, and to form interlayer by corncob best to the repairing effect of mud and heavy metal in soil.
The present invention selects for use the DTPA of variable concentrations to improve heavy metal in the enrichment of perennial ryegrass overground part and suppress sludge heavy-metal to the ability of deep soil leaching migration as the collaborative perennial ryegrass of chelating agent with by the interlayer that zeolite, vermiculite and corncob are formed.With the culture matrix of mud soil mixed-matrix as perennial ryegrass, treat that turfgrass grows into certain phase and uses DTPA, and simulation Tianjin rainfall and pH carry out leaching, measure content of beary metal in perennial ryegrass acrial part and the leaching liquor.This technology can be that the phytoremediation of heavy metal provides technical support in the mud.
The more detailed preparation method of the present invention:
1 experiment material and method
1.1 test material
Select for use English ryegrass (
Lolium perenne).Mud picks up from Tianjin discipline village sewage treatment plant, and is air-dry under the natural conditions.Complexing agent is selected the diethylene triamine pentacetic acid (DTPA) (DTPA) of prestige reagent company of huge section for use, and chemical formula is C
14H
23N
3O
10Soil is taken from garden mould in the institute of Tianjin Normal University (39 ° of 05'54'' of geographical coordinate north latitude, 117 ° of 10'26'' of east longitude).Mud fetch air-dry after, cross 2 mm sieve, corncob is pulverized the back with cracker, and to cross 60 mesh sieves standby.Mud and soil specimen analytical method adopt: the soil organic matter is measured and is adopted the outer heating method of the concentrated sulfuric acid-potassium bichromate, total soil nitrogen adopts the concentrated sulfuric acid to disappear and boils-Kjeldahl, the full phosphorus of soil adopts the concentrated sulfuric acid-perchloric acid to disappear and boils molybdenum antimony resistance colorimetric method, sludge nature is as follows: moisture content is 4.5%, the pH value is 6.9, and total nitrogen is 3.25%, and total phosphorus is 0.94%, total carbon is 25.98%, and potassium, calcium, magnesium nutrition metal element content are respectively 14327.5 mgkg
-1, 23509 mgkg
-1And 4410mgkg
-1The content of heavy metal Cd, Cr, Cu, Pb and Zn is respectively 2.01,1.875,140,203.25 and 1375.62 μ gg
-1
The physicochemical property of corncob is water content 9.6%, and the content of heavy metal Cu, Pb and Zn is respectively 35,16 and 289 μ gg
-1Cd, Cr do not detect.
Soil property is: pH 8.30, the content of organic matter 4.68%, full nitrogen 0.21%, full phosphorus 22.03 mgkg
-1, saturation moisture content 0.58 mlg
-1, the background value of its heavy metal Cd, Cr, Cu, Pb and Zn is respectively 0.18,2.13,9.33,5.75 and 35.57 μ gg
-1
1.2 artificial rainwater preparation
Be 4.00-8.24 according to investigation whole day Jinshi City Precipitation pH scope, a year average is 5.59, belongs to acid precipitation.This experiment (NH
4)
2SO
4, Na
2SO
4, K
2SO
4, MgSO
4, Ca (NO
3)
2, Mg (NO
3)
2, H
2SO
4Make SO
4 2-, NO
3-, Cl
-, NH
+, Mg
2+, Ca
2+, K
+, Na
+Concentration is respectively 14.96,6.54,1.68,3.71,0.82,1.38,0.64 and 0.78 mgL
-1Rainwater, and be 5.59 with HCl allotment pH.
1.3 research method
Experiment container is the pvc pipe of internal diameter 11 cm, lower end envelope cotton and nylon wire, the air-dry garden mould of 1000 g of in the pvc pipe of high 20 cm, at first packing into, pave, (mass ratio of mud and garden mould is 1:2 to reinstall 750 g mixed-matrixes, fully the mixed-matrix height is 8 cm), pave on garden mould; Between the pvc pipe garden mould of high 24 cm and mixed-matrix, add an interlayer (40 g vermiculites+40 g zeolites+40 g corncobs).Establish 6 processing altogether, be respectively: 1. 0 mmolkg
-1The DTPA+ perennial ryegrass; 2. 10 mmolkg
-1DTPA+perennial ryegrass; 3. 20 mmolkg
-1DTPA+perennial ryegrass; 4. 10 mmolkg
-1DTPA+ interlayer+perennial ryegrass; 5. 20 mmolkg
-1DTPA+ interlayer+perennial ryegrass; 6. 20 mmolkg
-1DTPA does not have plant.Except 6. not planting beyond the region of objective existence for contrast, all sow 1.0 g ryegrass seeds in the pvc pipe of all the other 5 processing, water with running water.Normal water supply between culture period, keeping its whole field capacity is 60%.Temperature and relative moisture indoor between planting season are respectively 16-25 ° of C and 36-57%, and intensity of illumination is 450-700 μ mol m
-2s
-1
The perennial ryegrass sowing was respectively 0,10,20 mmolkg with concentration after 30 days
-1DTPA is dissolved in the disposable mixed-matrix surface that imposes on of distilled water.After applying DTPA10 d, turfgrass is cradled, cradle back second day with the artificial acid rain of 300 mL and carry out the drip washing first time, per 7 d drip washing are afterwards once all used the artificial rainwater drip washing of 300 mL at every turn, and drip washing is 5 times altogether, and it is standby to collect leacheate.
1.4 the mensuration of content of beary metal
After the perennial ryegrass of cultivating 30 days cradles oven dry, adopt the quick digestion system WX-4000 of microwave to digest.Plant shoot branch: accurately take by weighing careless sample 0.2 g of drying to constant weight, earlier sample is put into standard can, add 3 mL HNO
3, add 4 mL HNO in the control jar
3, check seal, adopt the distribution digestion process, adjust the condition of clearing up: 150 ℃ of first step temperature, pressure 15 atm, times 4 min, 180 ℃ of second Buwen's degree, pressure are 20 atm, times 4 min, last digestive juice is with rare HNO of 1%
3Constant volume is to 25 mL.Percolate: measure 10 mL percolates, add 3 mL HNO
3, add 4 mL HNO in the control jar
3, check seal, adopt single step run digestion, establish 150 ℃ of temperature, pressure 15 atm, times 6 min, digestive juice is with rare HNO of 1%
3Constant volume is to 50 mL.Adopt the wherein content of heavy metal (Cu, Cd, Cr, Pb and Zn) of TAS-990 atomic absorption spectrophotometer.
1.5 data are handled
Adopt SPSS11.5 software Duncan method that the gained data are carried out many group sample differences significance analysis.
2 development results and analysis
2.1 utilize DTPA and interlayer that influence to the perennial ryegrass ground biomass is set
Variable concentrations DTPA and interlayer arrange perennial ryegrass acrial part biomass influence are seen Table 1.Compare with the processed group that does not add DTPA, adding 10 mmolkg
-1Behind the DTPA, perennial ryegrass acrial part biomass changes not obvious.Add 20 mmolkg
-1Behind the DTPA, its growth is had significant inhibitory effect, high concentration DTPA handles with the low concentration differences remarkable, and arranging the influence of perennial ryegrass acrial part biomass of interlayer is not obvious.
Table 1 different disposal is to the influence (g/PVC) of perennial ryegrass ground biomass
Annotate: with the different letter representation significant differences of line data (
P＜0.05)
2.2 DTPA utilization and interlayer arrange the influence to the perennial ryegrass heavy metal concentration
Different DTPA apply the collaborative interlayer of concentration, and the influence of perennial ryegrass heavy metal accumulation concentration is seen Table 2.The concentration that applies the overground part Cd of DTPA, Cr, Cu, Pb, Zn all be significantly increased (
P＜0.05).Only apply 10 and 20 mmolkg
-1DTPA all increases in perennial ryegrass overground part enrichment concentration to this 5 heavy metal species of Cd, Cr, Cu, Pb and Zn, is respectively 0 mmolkg
-11.41 and 1.95 times, 1.84 and 2.45 times, 2.24 and 2.82 times, 1.96 and 2.09 times, 2.25 and 2.99 times.Apply 10 mmolkg
-1Heavy metal is lower than 20 mmolkg in the concentration of perennial ryegrass overground part
-1DTPA.10 mmolkg
-1Under the DTPA concentration, interlayer is set after, perennial ryegrass acrial part heavy metal concentration all raises, except Cr, Zn concentration raise significantly, other heavy metal concentration raise all remarkable, Cu, Cd and Pb have raise 44.41%, 36.87% and 40.05% respectively.At 20 mmolkg
-1The concentration of Cd, Cr, Cu, Pb, Zn is not added the interlayer component and you can well imagine high 19.96%, 26.44%, 49.74%, 46.44% and 8.84% under the concentration.
Table 2 perennial ryegrass acrial part is to the enrichment of heavy metal
Annotate: with the different letter representation significant differences of line data (
P＜0.05)
The growing way of perennial ryegrass overground part heavy metal accumulation amount and perennial ryegrass is closely related, with 0 mmolkg
-1DTPA compares, and all processed group perennial ryegrass heavy metal accumulation amounts that add DTPA all significantly rise, because 20 mmolkg
-1The growth of the perennial ryegrass of DTPA has produced significant inhibitory effect, though at 20 mmolkg
-1Content of beary metal under the concentration of DTPA in the rye cursive script is higher than 10 mmolkg
-1, but except enriching quantity 20 mmolkg of Pb
-1Be significantly higher than 10 mmolkg
-1Outward, other heavy metal is applying 10 and 20 mmolkg
-1DTPA handles enriching quantity all significantly not to be increased.The enriching quantity of heavy metal applies 10 and 20 mmolkg for the processing that interlayer is arranged
-1The perennial ryegrass of DTPA is respectively 1.93 and 1.85 times, 2.39 and 2.46 times, 3.07 and 3.35 times, 2.51 and 2.43 times, 2.67 and 2.58 times of contrast to the enriching quantity of this 5 heavy metal species of Cd, Cr, Cu, Pb and Zn.Applying under the identical condition of DTPA concentration, the existence of interlayer make the heavy metal accumulation amount significantly improve (
P＜0.05).Illustrate that DTPA can improve heavy metal in the enrichment of perennial ryegrass overground part, interlayer is worked in coordination with 10 and 20 mmolkg
-1The heavy metal of DTPA is not remarkable in the enrichment difference of perennial ryegrass overground part.
2.3 DTPA utilizes and interlayer arranges heavy metal diafiltration behavioral implications
Table 3 has been listed concentration and the total amount of Cd, Cr, Cu, Pb and Zn in each pvc pipe percolate, and the result shows that DTPA has significantly strengthened dissolubility and the mobility of heavy metal.Simultaneously, after experimental data showed that also DTPA uses, perennial ryegrass and horizontal interlayer can effectively suppress the leaching migration of heavy metal.For content of beary metal in the percolate, DTPA concentration is 20 mmolkg
-1The time, the concentration ratio of heavy metal is not planted with concentration in the percolate of pvc pipe of perennial ryegrass in the percolate of plantation perennial ryegrass pvc pipe, and Cu few 22.38%; Cd few 37.39%; Cr few 13.08%; Pb few 46.67%; Zn few 14.03%.On the other hand, all plant in the processing of perennial ryegrass, under the processing of identical DTPA concentration, horizontal interlayer has also reduced the concentration of heavy metal in the effusion effectively, at 10 mmolkg
-1During DTPA handles, compare with the processing that only applies same concentrations DTPA but do not have an interlayer, Cu, Cd, Cr, Pb and Zn concentration all significantly reduce (
P＜0.05), Cu few 35.91%; Cd few 37.37%; Cr few 21.09%; Pb few 31.87%; Zn few 11.29%; At 20 mmolkg
-1During DTPA handles, and only apply same concentrations DTPA but do not have comparing of interlayer, except Pb, the concentration of Cu, Cd, Cr and Zn all significantly reduce (
P＜0.05), Cu few 31.72%; Cd few 37.66%; Cr few 5.8%; Zn few 20.83%.It can also be seen that from table the collaborative horizontal interlayer of perennial ryegrass stops significantly the migration of the leaching total amount of heavy metal, compared with the control, 10 mmolkg
-1With 20 mmolkg
-1DTPA and arranging under the processing of interlayer, Cu, Cd, Cr, Pb, Zn respectively contrast reduce 65.75% and 61.19%, 68.66% and 67.65%, 52.99% and 33.58%, 82.26% and 65.81%, 41.08% and 43.55%; The seepage total amount of Cu, Cd, Pb, Zn is 10 mmolkg in DTPA concentration
-1With 20 mmolkg
-1And arrange under the processing of interlayer and do not have significant difference, seepage total amount 10 mmolkg of Cr
-1DTPA has interlayer significantly less than 20 mmolkg
-1DTPA has the processed group of interlayer.
The concentration of heavy metal and total amount in table 3 leaching liquor (μ g/mL)
Annotate: with the different letter representation significant differences of line data (
P＜0.05)
3 development conclusions
In the present technique, the experimental group that interlayer arranged with the DTPA that applies same concentrations but the experimental group of not having an interlayer compare, interlayer can significantly improve Cd, Cu in one batch of grass of perennial ryegrass, Pb and the Zn enrichment of portion on the ground.Illustrate that thereby the water retention capacity that corncob has improved interlayer has prolonged the time that plant contacts and adsorbs with heavy metal, makes that plant can the more heavy metal of enrichment.Under identical DTPA concentration is handled, horizontal interlayer has also reduced the concentration of heavy metal in the effusion effectively, but interlayer can not stop their leaching fully, this is because DTPA is combined with a part of heavy metal ion and has been formed than stabilized complex, has weakened the crystallized ability to heavy metal.In this experiment, 10 mmolkg
-1The collaborative interlayer of DTPA is better than 20 mmolkg to the restriction of heavy metal migration
-1DTPA just illustrates that also the high concentration complexing agent can improve the chelating of heavy metal, has also increased the absorption of plant to heavy metal simultaneously, but plant absorbing not heavy metal also increasing, along with the leaching of acid rain, diafiltration causes very big threat to underground water in underground water.There is research when relatively EDTA and the Chinese cabbage of EDDS absorb influencing of Pb, Zn, Cd, to find that treatment effect is best is 10 mmolkg
-1EDTA and 10 mmolkg
-1EDDS, the concentration of Pb in leaf has increased by 94 and 102 times compared with the control respectively.So this experiment draws 10 mmolkg
-1DTPA is collaborative, and to form interlayer by corncob best to the repairing effect of mud and heavy metal in soil, and rehabilitation cost is minimum, and to phreatic pollution minimum.
Embodiment:
The present invention will be further described below in conjunction with specific embodiment, and following each embodiment only is used for explanation the present invention and is not limitation of the present invention.Wherein sludge nature is as follows: moisture content is that 4.5%, pH value is 6.9, and total nitrogen is 3.25%, and total phosphorus is 0.94%, and total carbon is 25.98%, and potassium, calcium, magnesium nutrition metal element content are respectively 14327.5 mgkg
-1, 23509 mgkg
-1And 4410mgkg
-1The content of heavy metal Cd, Cr, Cu, Pb and Zn is respectively 2.01,1.875,140,203.25 and 1375.62 μ gg
-1
The physicochemical property of corncob is water content 9.6%, and the content of heavy metal Cu, Pb and Zn is respectively 35,16 and 289 μ gg
-1Cd, Cr do not detect.
Soil property is: pH 8.30, the content of organic matter 4.68%, full nitrogen 0.21%, full phosphorus 22.03 mgkg
-1, saturation moisture content 0.58 mlg
-1, the background value of its heavy metal Cd, Cr, Cu, Pb and Zn is respectively 0.18,2.13,9.33,5.75 and 35.57 μ gg
-1
Embodiment 1
The corncob interlayer is characterized in that it is made up of 40g vermiculite+40 g zeolite+40g corncob.
Method by DTPA associating perennial ryegrass is repaired sludge heavy-metal is characterized in that being undertaken by following step:
(1) in pvc pipe, lower end envelope cotton and nylon wire, the garden mould that the 1000g that packs into is air-dry is paved, and reinstalls 750 g mixed-matrixes; Described mixed-matrix refers to: mud: the ratio of weight and number of garden mould is 1:2, and mud is paved on garden mould;
(2) between pvc pipe garden mould and mixed-matrix, add an interlayer; Described interlayer is made up of 40 g vermiculites+40 g zeolites+40 g corncobs;
(3) sowing 1.0 g ryegrass seeds in the pvc pipe, with running water pouring, normal water supply between culture period, keeping its whole field capacity is 60%; Temperature and relative moisture indoor between planting season are respectively 20 ° of C and 40%, and intensity of illumination is 450 μ mol m
-2s
-1
(4) the perennial ryegrass sowing was 10 mmolkg with concentration after 30 days
-1DTPA is dissolved in the disposable mixed-matrix surface that imposes on of distilled water; Then turfgrass is cradled, cradle back second day with the artificial acid rain of 300 mL perennial ryegrass is carried out the drip washing first time, per 7 d drip washing afterwards once, each artificial rainwater drip washing of all using 300 mL, drip washing is 5 times altogether, collects leacheate, carries out the mensuration of content of beary metal then;
Described artificial rainwater drip washing refers to: with (NH
4)
2SO
4, Na
2SO
4, K
2SO
4, MgSO
4, Ca (NO
3)
2, Mg (NO
3)
2, H
2SO
4Make SO
4 2-, NO
3-, Cl
-, NH
+, Mg
2+, Ca
2+, K
+, Na
+Concentration is respectively 14.96,6.54,1.68,3.71,0.82,1.38,0.64 and 0.78 mgL
-1Rainwater, and be 5.59 with HCl allotment pH.
Embodiment 2
The corncob interlayer is characterized in that it is made up of 40g vermiculite+60 g zeolite+100g corncob.
Method by DTPA associating perennial ryegrass is repaired sludge heavy-metal is characterized in that being undertaken by following step:
(1) in pvc pipe, lower end envelope cotton and nylon wire, the garden mould that the 1000g that packs into is air-dry is paved, and reinstalls 750 g mixed-matrixes; Described mixed-matrix refers to: mud: the ratio of weight and number of garden mould is 1:2, and mud is paved on garden mould;
(2) between pvc pipe garden mould and mixed-matrix, add an interlayer; Described interlayer is made up of 40g vermiculite+60 g zeolite+100g corncob;
(3) sowing 1.0 g ryegrass seeds in the pvc pipe, with running water pouring, normal water supply between culture period, keeping its whole field capacity is 60%; Temperature and relative moisture indoor between planting season are respectively 25 ° of C and 50%, and intensity of illumination is 600 μ mol m
-2s
-1
(4) the perennial ryegrass sowing was 20 mmolkg with concentration after 30 days
-1DTPA is dissolved in the disposable mixed-matrix surface that imposes on of distilled water; Then turfgrass is cradled, cradle back second day with the artificial acid rain of 300 mL perennial ryegrass is carried out the drip washing first time, per 7 d drip washing afterwards once, each artificial rainwater drip washing of all using 300 mL, drip washing is 5 times altogether, collects leacheate, carries out the mensuration of content of beary metal then;
Described artificial rainwater drip washing refers to: with (NH
4)
2SO
4, Na
2SO
4, K
2SO
4, MgSO
4, Ca (NO
3)
2, Mg (NO
3)
2, H
2SO
4Make SO
4 2-, NO
3-, Cl
-, NH
+, Mg
2+, Ca
2+, K
+, Na
+Concentration is respectively 14.96,6.54,1.68,3.71,0.82,1.38,0.64 and 0.78 mgL
-1Rainwater, and be 5.61 with HCl allotment pH.
Claims (4)
1. corncob interlayer that promotes lawn plant enrichment sludge heavy-metal is characterized in that it is made up of following raw material:
40-60 g vermiculite+40-80 g zeolite+40-100g corncob.
2. one kind is adopted the described corncob interlayer of claim 1, and the method by DTPA associating perennial ryegrass is repaired sludge heavy-metal is characterized in that being undertaken by following step:
(1) in pvc pipe, lower end envelope cotton and nylon wire, the garden mould that the 1000g that packs into is air-dry is paved, and reinstalls 750 g mixed-matrixes; Described mixed-matrix refers to: mud: the ratio of weight and number of garden mould is 1:2, and mud is paved on garden mould;
(2) between pvc pipe garden mould and mixed-matrix, add an interlayer; Described interlayer is made up of 40 g vermiculites+40 g zeolites+40 g corncobs;
(3) sowing 1.0 g ryegrass seeds in the pvc pipe, with running water pouring, normal water supply between culture period, keeping its whole field capacity is 60%; Temperature and relative moisture indoor between planting season are respectively 16-25 ° of C and 36-57%, and intensity of illumination is 450-700 μ mol m
-2s
-1
(4) the perennial ryegrass sowing was 10-20 mmolkg with concentration after 30 days
-1DTPA is dissolved in the disposable mixed-matrix surface that imposes on of distilled water; Then turfgrass is cradled, cradle back second day with the artificial acid rain of 300 mL perennial ryegrass is carried out the drip washing first time, per 7 d drip washing afterwards once, each artificial rainwater drip washing of all using 300 mL, drip washing is 5 times altogether, collects leacheate, carries out the mensuration of content of beary metal then;
Described artificial rainwater drip washing refers to: with (NH
4)
2SO
4, Na
2SO
4, K
2SO
4, MgSO
4, Ca (NO
3)
2, Mg (NO
3)
2, H
2SO
4Make SO
4 2-, NO
3-, Cl
-, NH
+, Mg
2+, Ca
2+, K
+, Na
+Concentration is respectively 14.96,6.54,1.68,3.71,0.82,1.38,0.64 and 0.78 mgL
-1Rainwater, and be 5.59-5.61 with HCl allotment pH.
3. the described DTPA associating of claim 2 perennial ryegrass is repaired the application of sludge heavy-metal method in the plants enriched heavy metal of preparation promotion.
4. the described application of claim 2 wherein promotes plants enriched heavy metal to refer to 10 mmolkg
-1DTPA is collaborative to form interlayer to the reparation of heavy metal in the mud by corncob.
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| CN103270869B (en) | 2016-02-17 |
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